about 2 months ago - No comments
Jigsaw 6×6 puzzle 2Jigsaw 6×6 puzzle 1I just made some Jigsaw Sudoku puzzles for a book and had a couple spare which I thought I’d post here. Just place A to F once each into every row, column and bold-lined jigsaw shape.
about 1 year ago - No comments
Sudoku 6×6 puzzleJigsaw 6×6 puzzle
I had a couple of 6×6 Sudoku puzzles left over when making issue 58 of Sudoku Pro magazine, so I thought I’d post them here.
Just place 1-6 into each row, column and bold-lined area.
about 1 year ago - No comments
Sudoku 16×16 puzzle
And to complement the Killer Sudoku I posted a moment ago, here’s a 16×16 puzzle for those who like these. Just place 1 to 9 and A to G in each row, column and 4×4 box. Only “scan and place” logic is needed for this, I promise!
about 1 year ago - 1 comment
Killer Sudoku puzzle
Sudoku Xtra 11 is out now, but I’m holding off the announcement post until it’s available on Amazon.com too. In the mean time, here’s a Killer Sudoku puzzle.
Just place 1 to 9 in each row, column and bold-lined box. Each dashed-line cage should add to the given sum, and you can’t repeat a More >
about 1 year ago - No comments
Samurai 8X puzzle
When I was making Sudoku Xtra 10 I wanted to put in a really big Samurai Sudoku puzzle. In the end because I had a square page area available beneath the instructions I went with a 13-grid one (just as a one-off to see what sort of reaction it got!) but I had More >
about 1 year ago - No comments
Killer Plus Minus Samurai puzzle
If you’re a Sudoku Xtra reader you’ll have seen these in their regular 9×9 form in both issues 5 and 6, but this is the first time I’ve made a Samurai one, and the first time I’ve posted one here I think.
This is essentially a regular Killer Sudoku puzzle, except that More >
about 1 year ago - No comments
Killer Sudoku Pro 6×6 Samurai puzzle
It’s been quiet here recently – much of my effort has been going on my UK General Election site, How To Vote, although Sudoku Xtra 6 was out on Saturday too. Anyway, there are still 10 days to go to the election but after that I’ll get some time back!
However I thought I should More >
about 1 year ago - 3 comments
Toroidal Killer Jigsaw Toroidal puzzle
A while back someone asked for some variant toroidal patterns on PuzzleMix, so I was just adding a couple of them to the daily puzzles section when it occurred to me that I could put up a few toroidal killer sudoku too, for a change. However I then realised that the More >
about 1 year ago - 1 comment
Samurai Star XXXXX puzzle
I haven’t posted a puzzle for a week (it’s been a busy week, mind!) so it’s time to make up for that, just in time for the weekend.
In this puzzle the aim is pretty simple: place 1 to 9 in each set of 9 squares starting and ending with a bold line, More >
about 1 year ago - 2 comments
I wrote quite a lot yesterday about whether you “needed” the X in some Sudoku-X puzzles. I promised that I’d follow up with the result of analysing a stack of Killer Sudoku-X puzzles, and so here is that result.
I picked 64 Killer Sudoku-X puzzles (52 for the daily puzzlemix section plus 12 for the weekly More >
about 2 years ago
Nice change. Not hard. Division cages feel as if they will be very easy to deduce since the dividend can’t be above 9 in value.
I would call this puzzle “MathDoku”. In the case of generating more interest, that would be like calling sushi “Cold Raw Fish” since many hear the word maths and flee.
… but I still like the name.
about 1 year ago
Am i missing something? Spittledung says it’s not hard, but look at the bottom RH box – it doesn’t work!
Single box 8 must contain 8
9x can only be 1×9 (3×3 is not allowed)
24x can only be 2×3x4 (anything else needs a 1 – already used for 9x – or uses a single digit twice)
10x can only be 2×5 and as 24x contains 2, the 2 of 10x must be in he middle bottom box and the 5 in the bottom right box
So now, in the bottom right box, we have 1,2,3,4,5,8,9, and we have 2 empty boxes – where to place the 6 & 7?
The 7 can’t go in the 3- box because that would require a 10 from which to deduct 7 to get 3. So the 6 has to go in the 3- box … but wait a minute, that means the other digit has to be 9: 9-6=3 right? But there is already a 9 in the bottom row….
Or, as I said, am I missing something?
about 1 year ago
Minus signs are tricky in KenKen type puzzles…
It has been a while since I have done this puzzle, but the glitch in the logic above comes with the 3- cage. You say that the 7 can’t go into this cage, but it could be 7 and the other number being a 4 (7-4=3). Likewise the 6 might work with the other number being a 3 (6-3=3). Further solving needs to be done…
I believe the something you might be missing is that the digits can be in any order for subtraction cages so long as the bigger number minus the smaller number gives the result, For the 0- cage in the same region, the biggest number in the cage minus the other two combined give 0.
It is always great to see others commenting about puzzles. Please stick around Laine.
about 1 year ago
Hi there Spittledung!
Can’t have 7-4 or 6-3 in the 3- cage, that would put the 4 or the 3 in the square and the 24x cage already has both 3 & 4 in it!
I’ve got so hooked on the “all signs” Sudoku
about 1 year ago
I believe that you missed the point in my previous post…
The larger number does NOT have to be the first one in the 3- cage (the one on the left). So by your deductions above it IS possible to have “4 (on the left) and 7 (in the region which you are deducing)” or “3 (on the left) and 6 (in the region which you are deducing)”.
So it is possible to have either 4_7 or 3_6. Now continue solving….
about 1 year ago
Aha! Now I see
I thought that as division & subtraction aren’t commutative, the larger number(s) had to go first, and this is the first puzzles I’ve done where my assumption hasn’t worked!
Live & learn
Thanks for your explanations, now let’s see if I can solve the rest of the puzzle…
about 1 year ago
The largest number DOES have to go first. It’s just that it doesn’t matter what order you write them in the grid. Pick the largest number from the cage and use that first, then subtract or divide by the other numbers in the cage.
Hope this helps!
about 4 months ago
I love Killer Sudoku puzzles and at the weekend there was a Killer Sudoku Pro in The Telegraph. I have yet to attempt yours above but wonder if you have any more I can try. I only like the Killer types. Thanks for your time. These are fab !!! Jeanette
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about 3 months ago
There are more of these in each issue of my Sudoku Xtra magazine – take a look at http://www.sudokuxtra.com.
There are also loads of other puzzles too, of course! (And not just Sudoku variants)